title: Results on neutrinoless double-β decay of 76Ge from phase I of the GERDA experiment.
abstract: Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope (76)Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1 × 10(-2) counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of (76)Ge, T(1/2)(0ν) >2.1 × 10(25) yr (90% C.L.). The combination with the results from the previous experiments with (76)Ge yields T(1/2)(0ν)>3.0 × 10(25) yr (90% C.L.).
authors.affiliation: Physik Department and Excellence Cluster Universe, Technische Universität München, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Agostini
authors.forename: M
authors.initials: M
authors.lastname: Allardt
authors.forename: E
authors.initials: E
authors.lastname: Andreotti
authors.forename: A M
authors.initials: AM
authors.lastname: Bakalyarov
authors.forename: M
authors.initials: M
authors.lastname: Balata
authors.forename: I
authors.initials: I
authors.lastname: Barabanov
authors.forename: M
authors.initials: M
authors.lastname: Barnabé Heider
authors.forename: N
authors.initials: N
authors.lastname: Barros
authors.forename: L
authors.initials: L
authors.lastname: Baudis
authors.forename: C
authors.initials: C
authors.lastname: Bauer
authors.forename: N
authors.initials: N
authors.lastname: Becerici-Schmidt
authors.forename: E
authors.initials: E
authors.lastname: Bellotti
authors.forename: S
authors.initials: S
authors.lastname: Belogurov
authors.forename: S T
authors.initials: ST
authors.lastname: Belyaev
authors.forename: G
authors.initials: G
authors.lastname: Benato
authors.forename: A
authors.initials: A
authors.lastname: Bettini
authors.forename: L
authors.initials: L
authors.lastname: Bezrukov
authors.forename: T
authors.initials: T
authors.lastname: Bode
authors.forename: V
authors.initials: V
authors.lastname: Brudanin
authors.forename: R
authors.initials: R
authors.lastname: Brugnera
authors.forename: D
authors.initials: D
authors.lastname: Budjáš
authors.forename: A
authors.initials: A
authors.lastname: Caldwell
authors.forename: C
authors.initials: C
authors.lastname: Cattadori
authors.forename: A
authors.initials: A
authors.lastname: Chernogorov
authors.forename: F
authors.initials: F
authors.lastname: Cossavella
authors.forename: E V
authors.initials: EV
authors.lastname: Demidova
authors.forename: A
authors.initials: A
authors.lastname: Domula
authors.forename: V
authors.initials: V
authors.lastname: Egorov
authors.forename: R
authors.initials: R
authors.lastname: Falkenstein
authors.forename: A
authors.initials: A
authors.lastname: Ferella
authors.forename: K
authors.initials: K
authors.lastname: Freund
authors.forename: N
authors.initials: N
authors.lastname: Frodyma
authors.forename: A
authors.initials: A
authors.lastname: Gangapshev
authors.forename: A
authors.initials: A
authors.lastname: Garfagnini
authors.forename: C
authors.initials: C
authors.lastname: Gotti
authors.forename: P
authors.initials: P
authors.lastname: Grabmayr
authors.forename: V
authors.initials: V
authors.lastname: Gurentsov
authors.forename: K
authors.initials: K
authors.lastname: Gusev
authors.forename: K K
authors.initials: KK
authors.lastname: Guthikonda
authors.forename: W
authors.initials: W
authors.lastname: Hampel
authors.forename: A
authors.initials: A
authors.lastname: Hegai
authors.forename: M
authors.initials: M
authors.lastname: Heisel
authors.forename: S
authors.initials: S
authors.lastname: Hemmer
authors.forename: G
authors.initials: G
authors.lastname: Heusser
authors.forename: W
authors.initials: W
authors.lastname: Hofmann
authors.forename: M
authors.initials: M
authors.lastname: Hult
authors.forename: L V
authors.initials: LV
authors.lastname: Inzhechik
authors.forename: L
authors.initials: L
authors.lastname: Ioannucci
authors.forename: J
authors.initials: J
authors.lastname: Janicskó Csáthy
authors.forename: J
authors.initials: J
authors.lastname: Jochum
authors.forename: M
authors.initials: M
authors.lastname: Junker
authors.forename: T
authors.initials: T
authors.lastname: Kihm
authors.forename: I V
authors.initials: IV
authors.lastname: Kirpichnikov
authors.forename: A
authors.initials: A
authors.lastname: Kirsch
authors.forename: A
authors.initials: A
authors.lastname: Klimenko
authors.forename: K T
authors.initials: KT
authors.lastname: Knöpfle
authors.forename: O
authors.initials: O
authors.lastname: Kochetov
authors.forename: V N
authors.initials: VN
authors.lastname: Kornoukhov
authors.forename: V V
authors.initials: VV
authors.lastname: Kuzminov
authors.forename: M
authors.initials: M
authors.lastname: Laubenstein
authors.forename: A
authors.initials: A
authors.lastname: Lazzaro
authors.forename: V I
authors.initials: VI
authors.lastname: Lebedev
authors.forename: B
authors.initials: B
authors.lastname: Lehnert
authors.forename: H Y
authors.initials: HY
authors.lastname: Liao
authors.forename: M
authors.initials: M
authors.lastname: Lindner
authors.forename: I
authors.initials: I
authors.lastname: Lippi
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: A
authors.initials: A
authors.lastname: Lubashevskiy
authors.forename: B
authors.initials: B
authors.lastname: Lubsandorzhiev
authors.forename: G
authors.initials: G
authors.lastname: Lutter
authors.forename: C
authors.initials: C
authors.lastname: Macolino
authors.forename: A A
authors.initials: AA
authors.lastname: Machado
authors.forename: B
authors.initials: B
authors.lastname: Majorovits
authors.forename: W
authors.initials: W
authors.lastname: Maneschg
authors.forename: M
authors.initials: M
authors.lastname: Misiaszek
authors.forename: I
authors.initials: I
authors.lastname: Nemchenok
authors.forename: S
authors.initials: S
authors.lastname: Nisi
authors.forename: C
authors.initials: C
authors.lastname: O'Shaughnessy
authors.forename: L
authors.initials: L
authors.lastname: Pandola
authors.forename: K
authors.initials: K
authors.lastname: Pelczar
authors.forename: G
authors.initials: G
authors.lastname: Pessina
authors.forename: A
authors.initials: A
authors.lastname: Pullia
authors.forename: S
authors.initials: S
authors.lastname: Riboldi
authors.forename: N
authors.initials: N
authors.lastname: Rumyantseva
authors.forename: C
authors.initials: C
authors.lastname: Sada
authors.forename: M
authors.initials: M
authors.lastname: Salathe
authors.forename: C
authors.initials: C
authors.lastname: Schmitt
authors.forename: J
authors.initials: J
authors.lastname: Schreiner
authors.forename: O
authors.initials: O
authors.lastname: Schulz
authors.forename: B
authors.initials: B
authors.lastname: Schwingenheuer
authors.forename: S
authors.initials: S
authors.lastname: Schönert
authors.forename: E
authors.initials: E
authors.lastname: Shevchik
authors.forename: M
authors.initials: M
authors.lastname: Shirchenko
authors.forename: H
authors.initials: H
authors.lastname: Simgen
authors.forename: A
authors.initials: A
authors.lastname: Smolnikov
authors.forename: L
authors.initials: L
authors.lastname: Stanco
authors.forename: H
authors.initials: H
authors.lastname: Strecker
authors.forename: M
authors.initials: M
authors.lastname: Tarka
authors.forename: C A
authors.initials: CA
authors.lastname: Ur
authors.forename: A A
authors.initials: AA
authors.lastname: Vasenko
authors.forename: O
authors.initials: O
authors.lastname: Volynets
authors.forename: K
authors.initials: K
authors.lastname: von Sturm
authors.forename: V
authors.initials: V
authors.lastname: Wagner
authors.forename: M
authors.initials: M
authors.lastname: Walter
authors.forename: A
authors.initials: A
authors.lastname: Wegmann
authors.forename: T
authors.initials: T
authors.lastname: Wester
authors.forename: M
authors.initials: M
authors.lastname: Wojcik
authors.forename: E
authors.initials: E
authors.lastname: Yanovich
authors.forename: P
authors.initials: P
authors.lastname: Zavarise
authors.forename: I
authors.initials: I
authors.lastname: Zhitnikov
authors.forename: S V
authors.initials: SV
authors.lastname: Zhukov
authors.forename: D
authors.initials: D
authors.lastname: Zinatulina
authors.forename: K
authors.initials: K
authors.lastname: Zuber
authors.forename: G
authors.initials: G
authors.lastname: Zuzel